Improvement in sewing-machines



E. CLARKL Sewing Machine.

Patented Dec. 6, 1859;

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v UNITED STATES PATENT. OFFICEII EDWIN CLARK, or winnson, VER ONT.

IMPROVEMENT IN SEWING-MACHINES;

Specification forming part of Letters Patent No. 26,336, dated December6, 1859 T0 at whom it may concern Be it known that I, EDWIN CLARK, ofWindsor, in the county of Windsor and State of Vermont, have invented anew and useful Improvement in Sewing-Machines; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming part of thisspecification, in which- I Figure 1 is an inverted plan of a machinewith my improvements. Fig. 2 is a vertical section of the same. Fig. 3is an inverted plan of part of the machine in a different position tothat indicated in Fig. 1.

Similar letters of reference indicate corre sponding parts in theseveral figures.

My invention relates to that class of sewingmachines which make what isknown as the i double-looped stitch.

It consists in a novel and very simple mode of operating the underneedle, whereby the I stitch-making operation is rendered more certainthan in many other machines for making the same kind of stitch.

To enable others to make and use my invention, I will proceed todescribe its construction I and operation.

The bed-plate A, pillar B, stationary arm 0, main shaft F, upperneedle-bar, D, and its perforating-needle n, and the feeder E, and theirappendages are all applied, combined, and operated in the same manner asin many other sewing-machines, as will be understood by persons familiarwith such machines without further explanation.

to is the under needle, having its working part straight, and having aneye near its point, and resembling the under needle of many othermachines.

G is ahorizontal bar, to one end of which the under needle, a, is firmlysecured, and whose other end is connected with a crank-pin or eccentricwrist, I), carried by a horizontal bevel-gear, H, which is arranged torotate upon a fixed vertical pin or aXle, a, secured in the bed-plate A.At a short distance from the needle the said bar G passes through aguide, d, that is firmly secured to the bottom of the bed-plate, and thesides of thesaid guide are so rounded or beveled as to permit thelateral oscillating motion of the said bar that is produced by therotation of the crank-pin or Wrist b.

I is a guide-pin secured in a hanger, J, that is bolted to the bottom ofthe bed-plate for as- I sisting in the support of the bar G. The bar Gis represented inthe drawings as being made in two pieces, boltedtogether at e, forthe purpose of varying theefiective length of the barto adjust the needle, and the crank-pin or wrist I b is representedasattached to thegear H by an adjustable plate, f, which permitsitsposition to be changed to vary the stroke of the needle; but the barGmay be made in one piece, I

and the crank-pin or wrist be permanently secured in the gear Her otherequivalent rotating body by which itis carried. The bevelgear H derivesrotary motion froma bevelgear, I, on the main shaft F. Theunder needle,a, is supplied with thread froma spool,

R, arranged ina well-knownmanner below the I j bed-plate, and the saidthread is conductedto the said needle by means of elastic guide, I

9, attached to the bed-plate, and a guide, h, attached to the shank ofthe needle itself. For

the sake of distinction the thread from the per I 3 forating-needle n isshown in the drawings in red colors, and that from the lower needle, a,

in blue. The under needle, (1, derives from the y a crank-pin or wrist,under the control of the guide d, through which the bar G works, an

elliptical motion around the path of the perforating-needle, advancingon one SidBOf that path to enter and carry its own thread into the loopof the thread of that needle, and retiring on the opposite side of saidpathto receive that needle and its thread within the loop of its ownthread. Fig. 1 shows the under needle, a, ad I vancing into the loop ofthe thread of theper- I forating-needle n, andFig. 2 shows the needle aretiring and the needle n descending into the triangular opening formedbetween the loop of the said needle 71., that is on the. said needle (1,and the thread of the said needle a.

tinned retiring movement of the needle 11 forms I a loop of itsthreadaround the needle n. The I guide d, it will be observed, forms adouble fulcrum for the bar G, the latter bearing alternately upon thesides of the guide in describing the ellipse before described.

The above-described movement of the needle to, produced by the crankunder the control of the guide d, possesses the advantage of being morepositive and reliable in its operation and less liable to get out oforder, and prevents the under needle interfering with the perforatingThe conneedle, as, if properly adjusted, the former needle need nevertouch the perforating-needle, and therefore all liability of the needlesfouling and bending each other is entirely obviated.

I do not claim giving the'nnder needle an elliptical movement by whichit is made to advance on one sideof the path of the perforating-needleand retire on the other side thereof; but

What I claim as my invention, and desire to secure by Letters Patent,is-

crank-pin, with a perforating-needle, n, as

herein shown and described.

EDWIN CLARK.

Witnesses:

DANIEL STEARNS, GEO. W. WHITTLE.

